Cat bed



FIG. 1 is a perspective view taken from one end and one side of a cat bed showing my new design;

FIG. 2 is a elevational view taken from the side opposite that shown in FIG. 1;

FIG. 3 is an elevational view taken from the end opposite that shown in FIG. 1; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a cat bed, as shown. 